Features:

This SainSmart 4WD Drive Aluminum Mobile Robot Platform for Robot Arduino UNO MEGA2560 R3 Duemilanove

•  Can hold many controllers, drivers, sensors and RF modules etc.
•  Supports  plate with controller mounting holes, 2 dof pan.
•  Tilt holds down groove, collision switch mounting hole, can be added with sensors.
•  Elastic rubber tires. Damping, gripping, and wear-resisting.
•  Light weight, high strength and no deformation characteristics.
•  Unique design and color, cool feeling.

 
Specifications:

•  Reduction ratio: 1:48
•  No-load speed: 220rpm
•  Wheel diameter: 65mm
•  Wheel width: 26mm
•  Platform length: 206mm
•  Platform width: 200mm
•  Platform height: 62mm
•  Platform weight: 620g

Document:

Download Link

Raspberry Pi Code For 4WD